Differential flange nuts torque setting

Tech tips and how to's

Moderators: notoptoy, garth, S Allen

User avatar
ppeters914
Roadster Fanatic-Site Supporter
Posts: 2939
Joined: Mon Jun 28, 2004 5:51 pm
Location: Lake Forest Park, WA (just north of Seattle)
Model: 1500/1600
Year: Low Windshield-64-67.5

Differential flange nuts torque setting

Post by ppeters914 » Sat Apr 13, 2019 7:31 pm

Nothing in The Datsun Roadster Book.

From the TechWiki: Differential flange bolt - 8-9kg/m (57.8-65.1ft/lb.) Pat Mahoney's handy dandy Torque Values card similar.

Can anyone confirm these values? These are 5/16-24, mostly dry with a little gasket sealer on the treads.

Already seems pretty tight @ 40ft/lbs. Going to leave it there until I hear from the brain trust.

Thanks.
Last edited by ppeters914 on Sun Apr 14, 2019 4:07 pm, edited 1 time in total.
Pete
-------------------------------------
'67 1600 - frame off in progress. What a stupid idea. :smt021
'66 1600 - parts car
'66 WPL411 - no engine or trans. If I was smart, I would sell it.
A couple of Porsches, a pickup, and a motorcycle

User avatar
pebbles
Roadster Fanatic-Site Supporter
Posts: 3977
Joined: Thu Dec 16, 2010 12:00 am
Location: Washington

Re: Differential flange nuts torque setting

Post by pebbles » Sun Apr 14, 2019 12:38 am

Seems way to high for a 3/8.
Grade 5 max is 30 dry.
Grade 8 max is 45 dry.
Axle flange bolt?
David




"When we were standing next to the motor while on the dyno, and the motor hit VVL, eyes went watery.."

User avatar
ppeters914
Roadster Fanatic-Site Supporter
Posts: 2939
Joined: Mon Jun 28, 2004 5:51 pm
Location: Lake Forest Park, WA (just north of Seattle)
Model: 1500/1600
Year: Low Windshield-64-67.5

Re: Differential flange nuts torque setting

Post by ppeters914 » Sun Apr 14, 2019 12:51 am

No, the ten nuts that hold the differential in the housing.
Pete
-------------------------------------
'67 1600 - frame off in progress. What a stupid idea. :smt021
'66 1600 - parts car
'66 WPL411 - no engine or trans. If I was smart, I would sell it.
A couple of Porsches, a pickup, and a motorcycle

User avatar
Datrock
Roadsteraholic
Posts: 916
Joined: Fri Feb 14, 2003 1:25 pm
Location: Oregon

Re: Differential flange nuts torque setting

Post by Datrock » Sun Apr 14, 2019 1:07 pm

Pete, did you measure twice? 3/8" sounds a bit to big.

Toptech360
Roadsteraholic
Posts: 680
Joined: Mon Oct 28, 2013 1:59 pm
Location: Bellingham, Washington

Re: Differential flange nuts torque setting

Post by Toptech360 » Sun Apr 14, 2019 2:05 pm

The original description says bolt. I would think the flange at the end of the pinion for the 4 nuts/bolts that hold the driveshaft to the pinion flange would be around that torque value. The nuts that hold the 3rd member to the axle housing are more likely in the 20ftlb range if I were to speculate.
Dan
1964 Datsun SPL310. The Datsun
1997 Toyota Tacoma LX 4wd. The Truck
2009 Subaru Forester XT.
2017 Toyota AWD Swagger Wagon.

User avatar
ppeters914
Roadster Fanatic-Site Supporter
Posts: 2939
Joined: Mon Jun 28, 2004 5:51 pm
Location: Lake Forest Park, WA (just north of Seattle)
Model: 1500/1600
Year: Low Windshield-64-67.5

Re: Differential flange nuts torque setting

Post by ppeters914 » Sun Apr 14, 2019 4:06 pm

Datrock wrote:
Sun Apr 14, 2019 1:07 pm
Pete, did you measure twice? 3/8" sounds a bit to big.
Measured thrice, typoed once. :roll:

Should have said 5/16-24. Earlier post corrected.

Thanks for catching that Bill. :smt003
Pete
-------------------------------------
'67 1600 - frame off in progress. What a stupid idea. :smt021
'66 1600 - parts car
'66 WPL411 - no engine or trans. If I was smart, I would sell it.
A couple of Porsches, a pickup, and a motorcycle

User avatar
ppeters914
Roadster Fanatic-Site Supporter
Posts: 2939
Joined: Mon Jun 28, 2004 5:51 pm
Location: Lake Forest Park, WA (just north of Seattle)
Model: 1500/1600
Year: Low Windshield-64-67.5

Re: Differential flange nuts torque setting

Post by ppeters914 » Sun Apr 14, 2019 4:22 pm

Toptech360 wrote:
Sun Apr 14, 2019 2:05 pm
The original description says bolt. I would think the flange at the end of the pinion for the 4 nuts/bolts that hold the driveshaft to the pinion flange would be around that torque value. The nuts that hold the 3rd member to the axle housing are more likely in the 20ftlb range if I were to speculate.
I interpreted Differential flange in the TechWiki to mean the flange on the differential that goes over the studs on the housing.
differential.jpg
You do not have the required permissions to view the files attached to this post.
Pete
-------------------------------------
'67 1600 - frame off in progress. What a stupid idea. :smt021
'66 1600 - parts car
'66 WPL411 - no engine or trans. If I was smart, I would sell it.
A couple of Porsches, a pickup, and a motorcycle

Toptech360
Roadsteraholic
Posts: 680
Joined: Mon Oct 28, 2013 1:59 pm
Location: Bellingham, Washington

Re: Differential flange nuts torque setting

Post by Toptech360 » Sun Apr 14, 2019 4:29 pm

65ftlb seems excessive for those. Have you checked a fsm?
Dan
1964 Datsun SPL310. The Datsun
1997 Toyota Tacoma LX 4wd. The Truck
2009 Subaru Forester XT.
2017 Toyota AWD Swagger Wagon.

User avatar
ppeters914
Roadster Fanatic-Site Supporter
Posts: 2939
Joined: Mon Jun 28, 2004 5:51 pm
Location: Lake Forest Park, WA (just north of Seattle)
Model: 1500/1600
Year: Low Windshield-64-67.5

Re: Differential flange nuts torque setting

Post by ppeters914 » Sun Apr 14, 2019 7:02 pm

Toptech360 wrote:
Sun Apr 14, 2019 4:29 pm
65ftlb seems excessive for those. Have you checked a fsm?
The 311 and 411 manuals (which are pretty skimpy) just mention tightening the nuts in an alternating pattern. No torque values listed.

The 620 Resource site shows the Differential Attaching Nuts torque as 12-18 ft/lbs. A 620 pickup uses an H190 like the roadster; just different spline counts on the axles.

If 12-18 is correct, do I (should I) back off the nuts, then retorque, or.......????

Thanks,
Pete
-------------------------------------
'67 1600 - frame off in progress. What a stupid idea. :smt021
'66 1600 - parts car
'66 WPL411 - no engine or trans. If I was smart, I would sell it.
A couple of Porsches, a pickup, and a motorcycle

User avatar
pebbles
Roadster Fanatic-Site Supporter
Posts: 3977
Joined: Thu Dec 16, 2010 12:00 am
Location: Washington

Re: Differential flange nuts torque setting

Post by pebbles » Sun Apr 14, 2019 11:32 pm

Replace studs and nuts. Gasket might be compromised as well.
David




"When we were standing next to the motor while on the dyno, and the motor hit VVL, eyes went watery.."

Toptech360
Roadsteraholic
Posts: 680
Joined: Mon Oct 28, 2013 1:59 pm
Location: Bellingham, Washington

Re: Differential flange nuts torque setting

Post by Toptech360 » Mon Apr 15, 2019 1:31 am

It's possible if you leave it as is it would be fine, but, I totally understand not being comfortable with that. What pebbles said would be your best insurance (unfortunately).
Dan
1964 Datsun SPL310. The Datsun
1997 Toyota Tacoma LX 4wd. The Truck
2009 Subaru Forester XT.
2017 Toyota AWD Swagger Wagon.

User avatar
S Allen
Site Admin
Posts: 4079
Joined: Thu Dec 05, 2002 4:57 pm
Location: Knoxville, IA(Lake Redrock)Antioch, CA(Winter Months)
Model: 1500/1600
Year: Low Windshield-64-67.5

Re: Differential flange nuts torque setting

Post by S Allen » Mon Apr 15, 2019 1:41 am

So. Obviously this needs to be corrected.

S
66 Stroker-Sora Blue Patina
67.5 Stroker-Purple
67 SRL311-00279-resto project
Stock '72 240Z-Blue
2002 Ford F250 7.3 Diesel 2WD Hauler
2008 Toyota FJ Cruiser
2009 Smart ForTwo Passion Coupe
2013 Fiat 500 Abarth

User avatar
ppeters914
Roadster Fanatic-Site Supporter
Posts: 2939
Joined: Mon Jun 28, 2004 5:51 pm
Location: Lake Forest Park, WA (just north of Seattle)
Model: 1500/1600
Year: Low Windshield-64-67.5

Re: Differential flange nuts torque setting

Post by ppeters914 » Mon Apr 15, 2019 1:46 am

510 wagons also use the H190 live axle, and 510 guys confirm 12-18 ft/lbs.

After further consultation with Gordon & DEF, decided to back off 5 of the nuts, then retorque to 20 ft/lbs, then repeat with the other 5 nuts.
Pete
-------------------------------------
'67 1600 - frame off in progress. What a stupid idea. :smt021
'66 1600 - parts car
'66 WPL411 - no engine or trans. If I was smart, I would sell it.
A couple of Porsches, a pickup, and a motorcycle

Toptech360
Roadsteraholic
Posts: 680
Joined: Mon Oct 28, 2013 1:59 pm
Location: Bellingham, Washington

Re: Differential flange nuts torque setting

Post by Toptech360 » Mon Apr 15, 2019 10:35 am

That's a good idea. If no leaks then I think there is no harm no foul.

I suspect the 65ftlb torque value is for the driveshaft bolts.
Dan
1964 Datsun SPL310. The Datsun
1997 Toyota Tacoma LX 4wd. The Truck
2009 Subaru Forester XT.
2017 Toyota AWD Swagger Wagon.

User avatar
Gregs672000
Roadster Fanatic-Site Supporter
Posts: 6707
Joined: Fri Aug 07, 2009 11:47 pm
Location: Tacoma, WA

Re: Differential flange nuts torque setting

Post by Gregs672000 » Mon Apr 15, 2019 4:59 pm

65lbs would have twisted those puppies right off!
Greg Burrows
'67 2000 #588
Tacoma, WA